Finding the right bra size should not feel complicated. True Bra Size helps you calculate a practical starting size using just two simple body measurements.
Keep the tape parallel to the floor and avoid compressing breast tissue.
That is why True Bra Size goes beyond simply giving you a number.
The band should sit level around your torso and feel secure without becoming painfully tight.
Your breast tissue should sit comfortably inside the cups without obvious overflow, cutting in, or large empty spaces.
The wire should surround the breast tissue rather than resting on it. It should not repeatedly poke, pinch, or sit in an uncomfortable position.
A size calculator gives you somewhere to begin. Your current bra can also tell you a lot about what needs adjusting.
A band that moves upward at the back may be too loose. Consider testing a smaller band and checking the corresponding sister size so that cup volume does not change too dramatically.
Overflow at the top or sides can indicate that the cup is too small, although cup shape can also contribute to the problem.
Empty space does not automatically mean you need a much smaller bra. The cup may be too large, too tall, too shallow, or simply the wrong shape for your breast tissue.
Measure around your ribcage directly beneath your bust for the underbust measurement, then measure around the fullest part of your bust. Enter both measurements into the Bra Size Calculator to get an estimated starting band and cup size.
No. A calculated result should be treated as a starting size. Bra brands, fabrics, cup construction, wire width, breast shape, and band stretch can all affect fit.
A sister size is a nearby bra size with a different band and cup letter but a similar cup volume. It can be useful when your cups fit well but the band feels slightly too firm or too loose.
Measure again whenever your current bras stop fitting as expected or after noticeable body changes. Weight changes, pregnancy, ageing, hormonal changes, and other natural changes can affect breast and ribcage measurements.